Question

I have a LinearLayout(A) which is set to GONE in layout xml. What I want to achieve is that when a button(B) is clicked, the LinearLayout(A) will be set to VISIBLE and then I get its height to update the height of its parent layout. I managed to set the LinearLayout(A) to visible and also get its height, however I fail to update the height of its parent layout directly. The problem from my current code is that, the parent layout will only update itself after another UI Event is triggered (such as spinner drop down menu is opened, soft keyboard shown, etc.). What I really want is that the parent layout update itself directly after button(B) is clicked.

Here is my code.

@Override
public void onClick(View v) {
    if(v==buttonB) {
        ShowLinearLayoutA();
    }
}

private ViewTreeObserver vto;

private void ShowLinearLayoutA() {
    LinearLayoutA.setVisibility(View.VISIBLE);
    if (vto == null) {
        vto = LinearLayoutA.getViewTreeObserver();
        vto.addOnGlobalLayoutListener(new OnGlobalLayoutListener() {
            @Override
            public void onGlobalLayout() {
                ParentLayout.getLayoutParams().height=LinearLayoutA.getHeight();
                ParentLayout.invalidate();
            }
        });
    }
}

What did i do wrong ?

Excuse my English and Thank you very much in advance.

EDIT 1 :
I tried using runOnUiThread but it doesn’t work

My Edited Code

private void ShowLinearLayoutA() {
    LinearLayoutA.setVisibility(View.VISIBLE);
    if (vto == null) {
        vto = LinearLayoutA.getViewTreeObserver();
        vto.addOnGlobalLayoutListener(new OnGlobalLayoutListener() {
            @Override
            public void onGlobalLayout() {
                ParentLayout.getLayoutParams().height=LinearLayoutA.getHeight();
                runOnUiThread(new Runnable() {
                    @Override
                    public void run() {
                        ParentLayout.invalidate();
                    }
                });
            }
        });
    }
}

EDIT 2 :

I gave up trying this method. Instead, I used animation and got it working.
Thanks 🙂

Answer 1

I gave up trying this method. Instead, I used animation and got it working. Thanks 🙂